Pin extractor



Dec. 6, 1966 s. B. BEI-:MSTERBOER ETAL. 3,290,005

PIN EXTRACTOR Filed March 16, 1965 4 Sheets-Sheet 1 Dec. 6, 1966 PIN EXTRACTOR Filed March 16, 1965 s. B. BEEMSTERBox-:R ETAL 4 Sheets-Sheet 2 IN VENTORS.

Dec- 6, 1966 s. B. BEEMSTERBCER ETAL 3,290,005

PIN EXTRACTOB 4 Sheets-Sheet 3 Filed March 16, 1965 Dec. 6, 1966 s. B. BEEMSTERBOER ETAL 3,290,005

PIN EXTRACTOR 40M., wiwi UM@v firme/ww'.

United States Patent() 3,290,005 PIN EXTRACTOR Simon B. Beemsterboer, 1472i) Dearborn St., Dolton, Ill., :11nd Marcell Vander Heyden, 1716 Sheffield Ave., Dyer,

Filed Mar. 16, 1965, Ser. No. 440,190 17 Claims. (Cl. 254-18) This invention relates to a pin extractor, and more particularly -to a mobile device for extracting pins from pavement forms and the like. v

In forming paved surfaces, such as in the formation of Apaved highways and the like, the paving material in its iluid state is placed in forms held in place by pins carried in the forms and driven into the ground. After the pavement khas set up into a rigid state, the pins are extracted from the ground and the forms are removed. This pin extraction has heretofore been a laborious time consuming han-d operation.

It is, therefore, the object of this invention to provde a pin extractor which can quickly and elliciently extract ground-piercing pins as from pavement forms, which can extract pins of different diameters and lengths, which can be quickly and easily moved from one location to another, and which can be used in association with freshly set up pavement without damage to said pavement.

In accordance with one form of the invention, there is provided a carriage mounted on a plurality of wheels. A mast projects upwardly from the carrier and supports a `laterally projecting arm. A stabilizer post swingably connected to said arm extends downwardly therefrom and is provided at its lower end with a shoe releasably engageable with the form in which `the pin to be removed is carried.

A rst double acting cylinder is swingably connected at its upper end to the arm and is lixedly connected at its lower end to a rst jaw. A second jaw is swingably connected to said rst jaw for movement with and with respect tosaid iirst jaw. The jaws are movable with respect to each other by a second double acting cylinderoperatively connected at its opposite ends to points on said jaws remote from their axis of interconnection. In this manner, the jaws are raised and lowered by the action of said rst cylinder and movable with respect to each other by said second cylinder to grip and release the pin to be extracted. The upward force created by sai-d first cylinder after the second cylinder has -caused the jaws to bindingly grip the pin creates a counter downward force causing the stabilizer post to move downwardly so that its shoe will bear upon the upper `face of the form. Desirably,

bearing means are connected to said post and mast for raising the post to raise its shoe outof engagement with the form when the counter downwardly directed force on the post is released.

Conveniently, the carriage may be self propelled, and to this end, it is provided with a seat upon which an operator may ride. Power for actuating said lirst and second cylinders and the drive and steering mechanisms fo-r the carriage is provided by a motor and hydraulic pump assembly controlled by a plurality of valves located on the carriage in accessible position 4to the operators seat.

Other objects and features of the invention will become apparent from the more detailed description which follows and from the accompanying drawings in which:

FIG. 1 is a perspective rear View of a pin extractor ernbodying the invention;

FIG. 2 is a plan view of the pin extractor in FIG. l;

FIG. 3 is a front elevation of the pin extractor shown in FIG. 1;

'FIG. 4 is an enlarged fragmentary vertical section of 3,2%,05 Patented Dec. 6, 1966 lce a portion of the pin extractor showing the gripping jaws in raised and retracted position;

FIG. 5 is a fragmentary vertical section similar to FIG. 4, but showing the gripping jaws in lowered operative position; and

FIG. 6 is a diagrammatic showing of the hydraulic system for the pin extractor.

As shown in FIG. 1, in forming highways and other paved surfaces, the paving material 10 is poured into forms 12 which conventionally comprise a lower ground engaging plate 13 connected to a vertically extending plate 14 which terminates at its upper end in anv outwardly projecting flange 15. The plates 13 and 14 are braced by-a plurality of longitudinally spaced braces 16. A plurality of the braces 16 are provided with openings 17 in alignment with openings in the plate 13 so that pins 18 may be driven through the openings for holding the forms 12 in position until the paving material 1Q is set into a rigid state. The instant invention comprises a device for extracting the pins 18 from the ground and the forms to permit said forms to be removed.

As shown in FIGS. 1 and 2, our pin extractor cornprises a carriage 20 conveniently formed from transverse members 21, 22, and 23, interconnected by a pair of side rails 24 and 25. An upwardly extending support 26 is mounted on the member 21 and supports an operators seat 27. As shown in FIG. 2, the seat 27 is laterally offset from the longitudinal axis of the carriage adjacent the rear thereof. The carriage is further provided with a running board 28 connected to the side rail 25 and projecting laterally therefrom adjacent the seat 27. Another running board 29 is interconnected to the members 21 and 22 and extends therebetween on the opposite side 'of the seat 27 so that the running boards 28 and 29 form a pair of foot supports for an operator sitting in the seat 27.

A pair of braces 30 and 31 interconnect the members 21 and 22 inwardly from the side rails 24 and 25. An axle 32 carrying wheel 33 is supported on the brace 30 and side rail 25, and an axle 34 carrying Wheel 35 is supported on brace 31 and side rail 24, whereby the wheels 33 and 35 will support the rear portion of the carriage. The forward portion of the carriage is supported on a steerable wheel 36 mounted on a forwardly projecting boom. As shown, said boom comprises an arm 38 connected to an upright 39 projecting upwardly from the member 23. A second boom arm 40 is connected to a vertically extending mast 42 mounted on the carriage adjacent the side rail 25. The boom arms 38 and 40 are interconnected at their forward ends by a plate 43 carrying a sleeve 44 in which the upper end of a vertically extending spindle 45 for the wheel 36 is rotatably carried. Thus, the wheel 36 is `disposed at the forward end of the carriage and is laterally offset from the longitudinal carriage axis. As shown in FIG. 2, the spindle 45 is swingably connected by pin 46 to a ram 47 of cylinder 48 which is swingably connected by pin 49 to a bracket 50 mounted on the boom arm 38. Thus, upon actuation of the cylinder 48 the wheel 36 will swing about the axis of the spindle 45 for guiding the carriage.

As shown in FIG. l, the mast 42 projects upwardly from the carriage adjacent the side rail 25. Said mast is formed as a completely enclosed column provided with a ll pipe 51 whereby it serves as a hydraulic uid reservoir as will be more fully explained hereinafter. A post 52 extends upwardly from the side rail 24 adjacent its connection to the member 21 and supports a brace 53 rigidly connected to the mast 42 at the upper end thereof. A second brace 54 is connected to the forward end of the rail 24 and to the upperrend of the mast 42.

An arm comprising a pair of parallel interconnecting beams 55 is swingably connected to the upper end of the mast 42 by a pivot pin 56 rotatably carried in a sleeve 57 xedly mounted on the mast. A second pin 58 parallel with pin 56 is swingably carried in the beams 5 5 and supports a stabilizer post 59. The post 59, which 1s swingably interconnected to the mast 42 by the arm and the pin 58, extends downwardly from said arm with its lower portion slidably carried in a guide 60 xedly mounted on the running board 28. As shown in FIG. 4, said guide comprises a plate 61 xedly mounted on the running board 28 and connected by a pair of rollers 62 to a second plate 63 outboard of the plate 61 and post 59. In this manner, longitudinal movement of the post is confined by the plates 61 and 63, and fore rand aft movement of said post is conned by the rollers 62.

A horizontally disposed plate 64 is xedly mounted on the post 59 below the guide 60. Said plate is connected, as by bolts 65, to a shoe 66 normally disposed above the ground when the device is moving from one location to another, but disposed in a ground-engaging position when the device is extracting one of the pins 18 from the form 12.

Intermediate its height, the mast 42 is provided with an outwardly projecting bracket 70, and the post 59 is provided with an opposed inwardly projecting bracket 72. A bolt 73 extends through openings in the brackets 70 and 72 and through a coil spring 75. A nut 76 threadably received on the upper end of the bolt bears against the barcket 70 and a nut 77 threadably received on the lower end of said bolt supports a spring-retainer cup 78. The upper end of said spring bears against the bracket 72 and its lower end bears against the cup 78 to urge the post 59 upwardly with respect to the mast42 and dispose the shoe 66 out of engagement with the ground. l

A pair of downwardly projecting blocks 82 are con nected to the outer ends of the arm beams 55. Said blocks support a pivot pin 83 parallel to the horizontally disposed pins 56 and 58 and swingably connected to a tongue 84 formed on the upper Vv-er'icl'ti'fQ-fa downwardly extending hydraulic cylinder 86. Said 'cylinder has a vertically movable ram 87 -connected at its lower end to a gripping jaw` 88. As shown in FIGS. 4 and 5, the jaw 88 comprises a vertical portion 89 and an upper generally horizontal portion 90. The jaw 88 is swingably connected to a vbifurcated jaw 94 having a vertical portion 96 and horizontal portion 97 by'a pivot pin 92 transverse to the pins 56, 58, and 83. Desirably, the horizontal jaw portion 90 has a plurality of longitudinally spaced openings 98 in which a pin 100 on the upper end of a double acting cylinder 101 is selectively and swingably mounted. A plurality of longitudinally spaced openings 102 are also formed in the horizontal portion 97 of the jaw 94 in which a pin 103 carried in the end of the ram 104 is selectively and swingably mounted. Desirably, a paid of blocks 106 having serrated faces are removably mounted, as by screws 108, in the lower ends of the vertical jaw portions 89 and 96 with their serrated faces in confronting relationship. The blocks 106 are thus mounted on the jaws in positions in which their serrated faces` can bindingly grip a pin 18 upon movement of the jaw 94 with respect to the jaw 88 about the axis of the pin 92.

With the jaws 88 and 94 being interconnected to each other by the pin 92 and the cylinder 101 and its ram 104, both jaws will be moved vertically upon vertical movement of the ram 87. To guide the vertical movements of said jaws, an arm 110 projects rearwardly from the jaw 88 and is connected to a pair of plates 112 slidably carried against the lateral faces of the post 59 and interconnected by a pair of rollers 114 carried against the fore and aft faces of said post.

The cylinders 86- and 101 are hydraulically actuated,

and conveniently, the carriage 20 is hydraulically propelled and steered. To this end, an engine 118, conveniently a gasoline powered engine, is mounted on the cairriage members 21 and 22. The output shaft 120 of said engine is connected as. by a chain and sprocket drive assembly 122 to the input shaft 124 of a hydraulic pump 125 mounted on a plate 126 extending between the carriage members 22 and 23. l The mast 42, which serves as a hydraulic reservoir as previously indicated, is connected to the pump 125 by a conduit 130 and is further provided with an inlet manifold 131. A 'conduit 132 extends from the pump 125 to a four port control valve 133 which is also connected to the manifold 131 by a conduit 134. The valve 133 is connected to the upper and lower ends of the cylinder 101 by conduits 135 and 136, respectively. Another conduit 138 extends from the pump 125 to a four port valve 140 which is also'connected to the manifold 131 by a conduit 141. The valve 140 is connected to the upper and lowerk ends of the cylinder 86 by conduits 142 and 144, respectively. Still another conduit 146 is connected to a four port valve 14S which is also connected to the manifold 131 by a conduit 149. The valve 148 is connected to the front and rear ends Of the cylinder 48 by'conduits 150 and 152, respectively. And still another conduit 154 is connected to a four port valve 156 which is also connected to the manifold 131 by a conduit 157.` The valve 156 is connected by conduits 158 and 160 to a reversible hydraulic motor 172. The output shaft 174 ofthe motor 172 is connected by a chain and sprocket drive assembly'176 to the wheel 33. Conveniently, the valves 133, 140, 148, and 156 are mounted on a control'panel 180 mounted von a transverse support 182 connected to' the carriage member 22 by upright 183.

`In the operation of the device, the carriage is propelled in a forward direction by opening the valve 156 to permit the fluid to flow through the conduits 154 and 158 to the motor 172 and return through the conduits 160 and 157 to cause said motor to drive the wheel 35 in a direction to propel the carriage forwardly. If it is desired to propel thecarriage in a rearward direction the valve 156 is actuated to cause the iiuid to ow through the conduits 154 and 160 to the motor and return through conduits 158 and 157 to cause the motor to drive the wheel 35 in a reverse direction.

The carriage is ysteered by actuation of the valve 148. If it is desired to turn the carriage to the left as viewe-d in FIG. 6, the valve 148 is actuated to cause the fluid to flow through the conduits 146 and 150 to the cylinder 48 and return through conduits 152 and 149 to cause the ram 47 to retract and swing the wheel 36 to the left about the axis of the spindle 45. Conversely, to steer the carriage to the right as viewed in FIG. 61, t-he Valve 148 is actuated to cause the fluid t-o flow through the conduits 146 Iand 152 to the cylinder 48 and return through conduits and 149 to cause the ram 160 to extend and swing the wheel 36 to the right about the axis of the spindle 45.

With the carriage positioned to dispose the opening between the jaws 88 and 94 in vertical alignment with the pin 18 to be extracted, the valve 140 is actuated to cause the uid to flow through the conduits 138 and 142 to the cy-linder 86 and return through conduits 144 Iand 141 to force the ram S7 downwardly moving the jaws 88 and 94 in a like direction. This downward movement of the jaws is guided by the plates 112 and rollers 114 riding on the post 59. When the jaws 88 and 94 have been lowered to a position to disp-ose the serrated faces of the blocks 106 on opposite sides of the pin 18, the valve 133 is actuated to cause the fluid -to flow through the conduits 132 and 135 to the cylinder 101 and return through cond-uits 136 and 134 to extend the ram 104 to thus swing the jaw 94 about the axis of the pin 92 so that the blocks 106 bindingly grip the pin 18 as `shown in FIG. 5. With the bloc-ks 106 binldingly gripping the -pin 18, the valve 140 is again actuated to cause the uid to HOW through theiconduits 138 and 144 to the cylinder 85 and return through conduits 142 and 141 to raise the ram 87 upwardly to extract the pin.

As the pin is being extracted, there is a counter downward force developed in the cylinder 86 which, by reason of its interconnection through the arm beams 55, causes the post 59 to move downwardly, the post swinging about the axis of pin 51S and the arm swinging about the axis of pin 56. As the post is moved downwardly, its shoe 66 engages the form flanges immediately adjacent the pin 18 to hold the form in position and stabilize the carriage. After the pin has 'been extracted, the counter downward force on the post76 will lbe terminated, and the post will 4be raised by the action of the coil spring 75 so thatthe shoe d6 will be in a raised position above the form 12 and pavement 10. The raising and lowering movements of the post are guided by the plates 59 and 61 and the rollers 60 to confine said movements to ya single vertical plane.

While the device has been described as a self-propelled device, it is to `be understood, of course, that it can be mounted on a carriage propelled and steered in lany convenient manner.

We claim as our invention:

1. Apmobile pin extractoncomprising a carriage mounted on a plurality of wheels, a mast mounted on said carriage and projecting'upwardly therefrom, first power means operatively interconnected to said mast and to a first jaw for effecting vertical movement of said jaw, a second jaw connected to said first jaw for movement with and with respect to said first jaw, second power means connected lto said second jaw for moving said second jaw with respect to said first jaw for bindingly gripping a pin therebetween, means for selectively actuating said first and second power ine-ans, stabilizer means operatively interconnected to said carriage and engageable with the ground adjacent said pin, biasing y means interconnecting said stabilizer means and said carriage for urging said stabilizer means upwardly out off engagement with the ground and means for propelling and guiding said carriage.

2. A mobile pin extractor, comprising a carriage mounted on a pair of drive wheels and a steerable wheel, a mast mounted on said carriage and projecting upwardly therefrom, first power means operatively interconnected to said mast and to a first jaw for effecting vertical movement of said jaw, a second jaw connected to said first jaw for movement with and `with respect to said first jaw, second power means connected to said second jaw for moving said second jaw with respect to said first jaw for bindingly gripping a pin therebetween, means for selectively actuating said first and second power means, stab-ilizer means operatively interconnected to said carriage and engageable with the ground adjacent said pin, third power means operatively interconnected to at lea-st one of said drive wheels for effecting movement of said carriage, and fourth power means operatively connected to said steerable wheel for effecting movement of said steerable wheel for guiding the movements of the carriage.

3. A mobile pin extractor as set forth in claim 2 with the addition that said steerable wheel is connected to said carriage by a vertically extending spindle, and said fourth power means comprises a power cylinder swingably connected to the carriage and spindle on a pair of vertical axes.

4. A mobile pin extractor as set forth in claim 2 with the addition that a motor is mounted on said carriage for driving a hydraulic pump connected to a reservoir of hydrau-lic fiuid, said third power means is a hydraulic motor and said first, second, yand fourth power means are double acting hydraulic cylinders operatively connected to said pump, and a valve is interposed between said pump and each of -said hydraulic motor Iand hydraulic cylinders.

S. A mobile pin extractor as set forth in claim 4 in which said mast is said reservoir.

6. A mobile pin extractor, comprising a carriage supported on a pair of drive wheels and a steerable wheel,

said steerable wheel being disposed ladjacent the forward end of said carriage, a mast mounted on said carri-age and projecting upwardly therefrom, a first power cylinder operatively interconnected adjacent its upper end to said mast at one side of said carriage .and operatively co-nnected adjacent its lower end to a first jaw for effecting vertical movement thereof, a second jaw connected to said first jaw for movement with and with respect to said rst jaw, a second power cylin-der connected to said first and second jaws for moving 'said `second jaw'with respect to said first jaw for bindingly gripping a pin therebetween, an oper-ators seat mounted on said carriage offset from the longitudinal axis thereof toward said one side of said carriage, stabilizer means operatively interconnected to said carriage and releasably engageable wit-h the ground adjacent said one side of said carriage, and means for propelling said carriage. j

7. A molbile pin extractor, comprising a mob-ile carriage, a mast mounted on said carriage and projecting upwardly therefrom, first power means operatively interconnected to said mast and to a first jaw for effecting Vertical movement of saidA jaw, a second jaw connected to said first jaw for movement with and wit-h respect to said first jaw, second power means connected to said second jaw for moving said second jaw with respect to Said first jaw for bindingly gripping apin therebetween, means for selectively actuating said first and second power means, stabilizer means, operatively interconnected` to said carriage and engageable with the ground adjacent said pin and biasing means interconnecting said stabilizer means and said carriage for urging said stabilizer mean-supwardly out o-f engagement with the ground.

S. A mobile pin extractor as set forth in claim 7 in which said second jaw is swingably connected to said first jaw on a generally horizontal axis, and said second power means comprises a double acting power cylinder having its opposite ends connected to said firstand second jaws.

9. A mobile pin extractor, comprising a mobile carriage, a lmast mounted on said carriage and projecting upwardly therefrom, first power means operatively interconnected to said mast and to a first jaw for effecting vertical movement of said jaw, a `second jaw connected to said first jaw for movement with and with respect to said first jaw, second power means connected to said second jaw for moving said second j-aw with respect to said first jaw for bindingly gripping a pin therebetween, means for selectively actuating said first and second power means, stabilizer means operatively interconnected to said carriage and en-gageaible with the ground adjacent said pin, biasing means interconnecting said stabilizer means and said carriage for urging said stabilizer means upwardly out of engagement with the ground, and guide means mounted on said first jaw and slidably carried on said stabilizer means.

10. A molbile pin extractor, comprising a mobile carriage, a mast mounted on said carriage and projecting upwardly therefrom, `an arm swingably connected to said mast and projecting laterally therefrom, first power means swingably connected to said arm and to a first jaw for effecting vertical movement of said jaw, a second jaw movable with and with respect to said first jaw, second power means connected to sa'id second jaw for moving said seco-nd jaw with respect to said first jaw for bindingly gripping -a pin therebetween, and a vertically extending post swingably connected to said arm intermediate said mast .and first power means and movable with respect to said mast into engagement with the ground adjacent said pin.

11. A mobile pin extractor as set forth in claim 10 in which said arm is swingably connected to said mast, post,

and first power means on a plurality of laterally spaced horizontal axes, and said second jaw is swingably connected to said first jaw on a horizontal axis transverse to said plurality of laterally spaced horiozntal axes.

12. A mobile pin extractor, comprising a mobile carriage, a mast mounted lon said carriage and projecting upwardy therefrom, an arm swingably connected to said mast and projecting later-ally'therefrom, first power means swingably connected to said arm and to a first jaw fo-r effecting vert'ical movement of said jaw, a second jaw movable with and with Irespect to said first jaw, second power means connected to said second jaw for'moving said second jaw with respect to said first jaw for bindingly gripping a lpin therebetween, a vertically extending post slidably connected to said carriage adjacent its lower end and swingably connected adjacent its upper end to said arm intermediate said mast and first power means, said postlbeing movable downwardly into ground engagement upon movement of said first yand second jaws upwardly during pin extraction, and biasing means interconnecting said mast and post intermediate their lengths urging said post upwardly out of enga-gement with the ground.

13. A mobile pin extractor as set forth in claim 12 with the addition that guide means are |monnted on said carriage for guiding the movements of said post.

14. A mobile pin extractor as set forth in claim 1 with the addition that lguide means are mounted on said first jaw engageable with said post for guiding the movements of said first and second jaws with respect to said post.

15. A mobile pin extractor as set forth'in claim 12 with the addition that first guide means are mounted on said iirst jaw engageable with said post for guiding the movements of said first and second jaws with respect to said post, and second-guide means are mounted on said carriage for'guiding the movements 'of said post.

16. A mobile pin extractor as set forth in claim 12 with the addition that said post isA provided with a removably mounted shoe-'ion its lower en-d.'

17. 'A'mobile pin extractor comprising a mobi-le carriage, a mast mounted on said carrige .and projecting upward-ly therefrom, irst power means operatively interconnected to said mast and to a first jaw for effecting vertical lmovelment of said jaw, a second jaw connected to said rst jaw for movement with `and with respect to said rst jaw, second power means connected to said second jaw for moving said second jaw with respect to said rst jaw for bindingly gripping a pin therebetween, means for selectively actuating said rst and said second power means, stabilizer means operatively interconnected to Said carriage and engagealble with the ground Vadjacent said pin, said second jaw being swingably connected to Said first jaw -on a generally horizontal axis, said'second power means comprising a double acting power cylinder having its opposite ends connected to said first and second jaws, and said first and second jaws having generally vertica-l portions for gripping said pin and generally horizontal portions connected to said power cylinder, the horizont-a1 portion on at least one of said jaws having a plurality of longitudinally spaced points thereon for releasably connecting said power cylinder thereto.

References Cited bythe Examiner UNITED STATES PATENTS 1,270,667 6/1918 Smith 269-24 X 2,709,570 5/1955 Henry 254--18 2,789,648 4,/1957 Huffman 180-66 2,911,190 ll/l959 Creason 254-18 2,985,455 5/l961 Powe'll 269-31 3,006,427 1 0/l96l Van -der Lely l8027 3,057,425 10/1962 Proett ISO-27 3,063,676 1l/l962 Robinson 254-30 X 3,096,075 7/1963 Brown 254%.29

WILLIAM FELDMAN, Primlary Examiner.

MILTON S. MEHR, Examiner. 

1. A MOBILE PIN EXTRACTOR, COMPRISING A CARRIAGE MOUNTED ON A PLURALITY OF WHEELS, A MAST MOUNTED ON SAID CARRIAGE AND PROJECTING UPWARDLY THEREFROM, FIRST POWER MEANS OPERATIVELY INTERCONNECTED TO SAID MAST AND TO A FIRST JAW FOR EFFECTING VERTICAL MOVEMENT OF SAID JAW, A SECOND JAW CONNECTED TO SAID FIRST JAW FOR MOVEMENT WITH AND WITH RESPECT TO SAID FIRST JAW, SECOND POWER MEANS CONNECTED TO SAID SECOND JAW FOR MOVING SAID SECOND JAW WITH RESPECT TO SAID FIRST JAW FOR BINDINGLY GRIPPING A PIN THEREBETWEEN, MEANS FOR SELECTIVELY ACTUATING SAID FIRST AND SECOND POWER MEANS, STABILIZER MEANS OPERATIVELY INTERCONNECTED TO SAID CARRIAGE AND ENGAGEABLE WITH THE GROUND ADJACENT SAID PIN, BIASING MEANS INTERCONNECTING SAID STABILIZER MEANS AND SAID CARRIAGE FOR URGING SAID STABILIZER MEANS UPWARDLY OUT OF ENGAGEMENT WITH THE GROUND AND MEANS FOR PROPELLING SAID GUIDING SAID CARRIAGE. 